<!DOCTYPE html>
<html xmlns="http://www.w3.org/1999/xhtml">

<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport"
        content="width=device-width, initial-scale=1, maximum-scale=1, minimum-scale=1, user-scalable=no">
    <title>primitive_合并</title>
    <link href="../Build/Cesium/Widgets/widgets.css" rel="stylesheet" />
    <script src="../Build/Cesium/Cesium.js"></script>
    <style>
        html,
        body,
        #cesiumContainer {
            width: 100%;
            height: 100%;
            margin: 0;
            padding: 0;
            overflow: hidden;
        }
    </style>

</head>

<body>
    <div id="cesiumContainer"></div>
    <script>
        let osm = Cesium.createOpenStreetMapImageryProvider({
            url: 'https://a.tile.openstreetmap.org/'
        });
        let viewer = new Cesium.Viewer('cesiumContainer', {
            imageryProvider: osm,
            contextOptions: {
                webgl: {
                    alpha: true
                }
            },
            selectionIndicator: false,
            animation: false,  //是否显示动画控件
            baseLayerPicker: false, //是否显示图层选择控件
            geocoder: false, //是否显示地名查找控件
            timeline: false, //是否显示时间线控件
            sceneModePicker: false, //是否显示投影方式控件
            navigationHelpButton: false, //是否显示帮助信息控件
            infoBox: false,  //是否显示点击要素之后显示的信息
            fullscreenButton: false
        });
        //取消双击事件
        viewer.cesiumWidget.screenSpaceEventHandler.removeInputAction(Cesium.ScreenSpaceEventType.LEFT_DOUBLE_CLICK);
        //设置homebutton的位置
        Cesium.Camera.DEFAULT_VIEW_RECTANGLE =
            Cesium.Rectangle.fromDegrees(110.15, 34.54, 110.25, 34.56);//Rectangle(west, south, east, north)
        //设置初始位置
        viewer.camera.setView({
            destination: Cesium.Cartesian3.fromDegrees(110.20, 34.55, 3000000)
        });

        //开启深度检测
        //viewer.scene.globe.depthTestAgainstTerrain = true;

        let instances = [];

        for (let lon = -180.0; lon < 180.0; lon += 5.0) {
            for (let lat = -85.0; lat < 85.0; lat += 5.0) {
                instances.push(new Cesium.GeometryInstance({
                    geometry: new Cesium.RectangleGeometry({
                        rectangle: Cesium.Rectangle.fromDegrees(lon, lat, lon + 5.0, lat + 5.0),
                        vertexFormat: Cesium.PerInstanceColorAppearance.VERTEX_FORMAT
                    }),
                    attributes: {
                        color: Cesium.ColorGeometryInstanceAttribute.fromColor(Cesium.Color.fromRandom({ alpha: 0.5 }))
                    }
                }));
            }
        }

        viewer.scene.primitives.add(new Cesium.Primitive({
            geometryInstances: instances,
            appearance: new Cesium.PerInstanceColorAppearance()
        }));



        //合并图元，并单独设置颜色属性
        let instance = new Cesium.GeometryInstance({
            geometry: new Cesium.RectangleGeometry({
                rectangle: Cesium.Rectangle.fromDegrees(-100.0, 20.0, -90.0, 30.0),
                vertexFormat: Cesium.EllipsoidSurfaceAppearance.VERTEX_FORMAT
            })
        });
        
        let anotherInstance = new Cesium.GeometryInstance({
            geometry: new Cesium.RectangleGeometry({
                rectangle: Cesium.Rectangle.fromDegrees(-85.0, 20.0, -75.0, 30.0),
                vertexFormat: Cesium.PerInstanceColorAppearance.VERTEX_FORMAT
            }),
            attributes: {//为每一个instance设置颜色属性
                color: new Cesium.ColorGeometryInstanceAttribute(1.0, 0.0, 0.0, 0.8)
            }
        });

        viewer.scene.primitives.add(new Cesium.Primitive({
            geometryInstances: [instance, anotherInstance],//可以传入多个instance
            appearance: new Cesium.PerInstanceColorAppearance()
        }));
    </script>
</body>

</html>